i had a evolution well istill do actually but it was a .40, came with my plane and never ran from the first try out of the box. would not take any settings lean or rich and acted very strange. it would start up and would run all day long at low speeds but as sooon as you hit it wide open, it would either die or would run good for 10 seconds and then bog and just go back and forth. I tried different plugs, i checked for leaks and nothing, same thing. i changed to different tank (same thing).i took it off the plane and mounted it to a stand and no matter what i tried it still done the same thing at high speeds, would go in and out from slow to wide open but never would really let loose of all it had, i gave up i took it off the stand and put it aside and now am running a dependable O.S. 46 LA. at least i can fly now!

thanks!